I only heard bad things about the Puffitt, the only good thing is that it resembles an inhalator.
Otherwise many reputable members here like Vitolo say the NO2 is a good device overall.
They not really comparable , other then the fact they are both vape's IMHO . If your chosing between the two for some reason if either will fill your needs get the NO2 . If you go through their respected threads [ just the last 25 pages of the NO2 thread should be enough ] you'll see how different they are .